Add docstring enforcement

[blink1073]

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[codecov]

Codecov Report

Base: 86.80% // Head: 86.80% // No change to project coverage 👍

Coverage data is based on head (18a7d37) compared to base (63d287d).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #97   +/-   ##
=======================================
  Coverage   86.80%   86.80%           
=======================================
  Files           5        5           
  Lines         288      288           
  Branches       69       69           
=======================================
  Hits          250      250           
  Misses         19       19           
  Partials       19       19           

Impacted Files	Coverage Δ
pytest_check_links/__main__.py	83.33% <ø> (ø)
pytest_check_links/_version.py	100.00% <ø> (ø)
pytest_check_links/args.py	93.33% <ø> (ø)
pytest_check_links/plugin.py	86.00% <ø> (ø)

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